The End of the World as We Know It
I don't think the world will end per se but yeah, if we keep messing up the Earth, it will be uninhabitable. Until humans stop thinking "us vs them" and think "we", there is no chance for survival. Doomsday won't be caused by God(s) but by our own doing.
Scientifically speaking, the sun may die out as stars don't last forever. The world could end if we no longer have a heat source.
Meanwhile, we all should be making the most of our home. I really want to start a garden.